IOS中NSTimer消除线程阻塞问题

游长江

于 2013-05-01 23:48:43 发布

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__block TestViewController *blockSelf = self;
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    blockSelf->_timer=[NSTimer scheduledTimerWithTimeInterval:1.0
                                            target:blockSelf
                                        selector:@selector(caculateLeftTimeForTomorrow)
                                          userInfo:nil
                                           repeats:YES] ;
    [[NSRunLoop currentRunLoop] addTimer:blockSelf->_timer forMode:NSDefaultRunLoopMode];
    [[NSRunLoop currentRunLoop] run];
     });

只是在原来的基础上加了个队列,并在backgroud中启动timer,这样,基本上就解决了阻塞的问题了. (由于block引用了self的参数,导致self被retain,导致页面无法释放,所以 __block转换self为本地局部变量)